pcb assembly

When customers customize PCB products, they will always make more in case of emergency. After a long time, there will be a phenomenon that the PCB board expires but is ignored by itself. So, what are the hazards of using expired PCB circuit boards?

1. Expired PCBs may cause oxidation of the surface pads

Oxidation of the pads will result in poor solder, which may eventually lead to functional failure or risk of dropped parts.

Different surface treatments of circuit boards have different anti-oxidation effects. In principle, ENIG requires that they be used up within 12 months; while OSP requires that they be used up within six months.

It is recommended to follow the shelf life of the PCB board factory to ensure quality.

2. Expired PCB may absorb moisture and cause PCB cracking

Problems such as popcorn effect, cracking or delamination may occur when the circuit board absorbs moisture and is reflowed. Although this problem can be solved by baking, baking may cause other quality problems.

3. The gluing ability of expired PCBs may degrade and deteriorate

After the circuit board is produced, the bonding ability between its layers will gradually degrade or even deteriorate over time.

When passing through the high temperature of the reflow furnace, it may cause the delamination of the circuit board and the generation of surface bubbles, which seriously affects the reliability of the circuit board.

In short, the harm of using expired PCB circuit boards is still quite large, and customers and friends should pay attention.